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下载163的repo文件

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cd /etc/yum.repos.d/
wget http://mirrors.163.com/.help/CentOS6-Base-163.repo

备份CentOS自带的源，用mv修改一下文件名就行，我没备份直接删了…

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mv CentOS-Base.repo CentOS-Base.repo.bak

把刚刚下载的163源repo文件重命名为系统自带源

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mv CentOS6-Base-163.repo CentOS-Base.repo

更新源

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yum clean all
yum makecache
yum update

OK 可以用了，可以测试下

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yum -y install vim
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Loaded plugins: fastestmirror, security
Setting up Install Process
Loading mirror speeds from cached hostfile
Package 2:vim-enhanced-7.2.411-1.8.el6.x86_64 already installed and latest version
Nothing to do

说明可以用了